:root {
    /* CSS Variables akan di-update oleh JS berdasarkan tema */
    --bg-dark: #0f172a;
    --panel-bg: #1e293b;
    --border: #334155;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    /* Default: No scroll di desktop */
    transition: background-color 0.3s, color 0.3s;
}

/* --- HEADER --- */
header {
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border);
    padding: 10px 20px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    z-index: 10;
    flex-shrink: 0;
    /* Header jangan menyusut */
    transition: background-color 0.3s, border-color 0.3s;
}

/* Controls */
.controls-container {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    flex: 1;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 100px;
    /* Agar slider tidak gepeng */
}

.control-group label {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.control-group span {
    color: var(--accent);
    font-weight: bold;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    max-width: 140px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    /* Target sentuh lebih besar */
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 2px solid var(--bg-dark);
    transition: transform 0.1s;
}

input[type="range"]:active::-webkit-slider-thumb {
    transform: scale(1.2);
}

.action-group {
    display: flex;
    gap: 10px;
    margin-left: auto;
    align-items: center;
}

/* Select Theme Style */
.theme-select {
    background-color: var(--bg-dark);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    outline: none;
}

button {
    background-color: var(--panel-bg);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s;
    touch-action: manipulation;
    /* Optimasi touch */
}

button:hover {
    filter: brightness(1.1);
}

button.primary {
    background-color: var(--accent);
    border-color: var(--accent);
    color: white;
}

button.primary:hover {
    filter: brightness(1.1);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* --- MAIN DASHBOARD --- */
.dashboard {
    display: grid;
    grid-template-columns: 1fr 1fr;
    /* Default desktop: 2 kolom */
    gap: 1px;
    background-color: var(--border);
    flex: 1;
    min-height: 0;
    /* Penting untuk overflow hidden container */
    position: relative;
}

.panel {
    background-color: var(--bg-dark);
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 10px;
    transition: background-color 0.3s;
    overflow: hidden;
}

.panel-header {
    text-align: center;
    margin-bottom: 5px;
    color: var(--text-muted);
    font-size: 14px;
    letter-spacing: 1px;
    font-weight: 600;
    text-transform: uppercase;
    flex-shrink: 0;
}

/* Network Canvas Area */
#networkContainer {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
    width: 100%;
    height: 100%;
}

/* Chart Area */
#chartContainer {
    flex: 1;
    position: relative;
    width: 100%;
    height: 100%;
    padding: 5px;
    box-sizing: border-box;
}

/* Overlay Stats */
.overlay-stat {
    position: absolute;
    bottom: 20px;
    right: 20px;
    text-align: right;
    pointer-events: none;
    z-index: 5;
}

.stat-value {
    font-size: 48px;
    font-weight: bold;
    color: var(--text-main);
    opacity: 0.1;
    line-height: 1;
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
    opacity: 0.4;
    text-transform: uppercase;
}

/* --- RESPONSIVE MEDIA QUERIES --- */
@media (max-width: 900px) {
    body {
        height: auto;
        /* Biarkan tumbuh vertikal */
        min-height: 100vh;
        overflow-y: auto;
        /* Izinkan scroll di mobile */
    }

    header {
        flex-wrap: wrap;
        gap: 15px;
        padding: 15px;
        position: sticky;
        /* Header nempel di atas saat scroll */
        top: 0;
    }

    .controls-container {
        width: 100%;
        justify-content: space-between;
        display: grid;
        grid-template-columns: 1fr 1fr;
        /* Grid 2 kolom untuk slider */
    }

    .control-group {
        width: 100%;
        min-width: 0;
    }

    input[type="range"] {
        max-width: none;
        /* Full width slider */
    }

    .action-group {
        margin-left: 0;
        width: 100%;
        justify-content: space-between;
        /* Tombol memenuhi lebar */
        margin-top: 5px;
        padding-top: 10px;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .action-group button {
        flex: 1;
        /* Tombol sama besar */
    }

    .dashboard {
        grid-template-columns: 1fr;
        /* Stack 1 kolom */
        grid-template-rows: auto auto;
        display: block;
        /* Block layout lebih aman untuk scroll */
        flex: none;
        /* Disable flex shrinking */
    }

    .panel {
        height: 50vh;
        /* Set tinggi fix yang nyaman di HP */
        min-height: 350px;
        border-bottom: 1px solid var(--border);
    }
}